An Austin couple wanted to add on to their small two-bedroom bungalow, but they didn’t want to move out and they didn’t want to use backyard space, so architect Nicole Blair decided to bolt an ADU (accessory dwelling unit) to their roof.

The steel structure was prefabbed off-site and in less than 24 hours, placed on top of four steel columns (3 of which pierce the original house). The 660-square-foot cottage sit just two feet above the main home, but just under the city’s height limit.

The “upstairs cottage” has a kitchen, living room, bedroom and a second room which one of the owners, a hairstylist, uses as a hair salon. The owners named the new space “The Perch” which Blair says reminds her of the birds often perched on top of it when she visits.